Control Valve Sizing Calculator

Upstream pressure is the pressure on the inlet side of a pipe, and the downstream pressure is the pressure in the outlet pipe. Specific gravity is the mass of a substance to the mass of a reference substance for the same given volume. Use our online control valve sizing calculator to do control valve sizing and flow coefficient calculation by entering the input values of flow rate, upstream pressure, downstream pressure, specific gravity, and temperature.

Control Valve Sizing and Flow Coefficient Calculation

SCFM
psia
psia
kgm-3
degree

Upstream pressure is the pressure on the inlet side of a pipe, and the downstream pressure is the pressure in the outlet pipe. Specific gravity is the mass of a substance to the mass of a reference substance for the same given volume. Use our online control valve sizing calculator to do control valve sizing and flow coefficient calculation by entering the input values of flow rate, upstream pressure, downstream pressure, specific gravity, and temperature.

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Formula:

x = q / [(16.05 √a2 - b2) / (s (t + 460))] Where, x = Valve Sizing Coeffecient q = Flow in SCFM a = Upstream Pressure in psia b = Downstream Pressure in psia s (Specific Gravity) = Density gas / density air at 14.696 psia and 60F t = Temperature in Degrees F

Example:

Calculate the control valve sizing and flow coefficient based on the flow rate of 50 SCFM, upstream pressure of 20 psia, downstream pressure of 15 psia, specific gravity of 20 and temperature of 60° F

Solution:

x = 50 / [(16.05 √202 - 152) / (20 (60 + 460))]
= 24.0156


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